Welding MCQ Questions and Answers Quiz

11. The size of a welding machine is determined by

  1. Input amperage
  2. Output amperage
  3. Open circuit voltage
  4. Closed circuit voltage

12. If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be

  1. L mm
  2. L + 2 mm
  3. L + 4 mm
  4. L + 6 mm

13. In a gas cut plate, the cut is high quality although there is some surface roughness caused by vertical drag lines. This is due to

  1. less preheating flame
  2. impure cutting oxygen
  3. too slow cutting speed
  4. smaller size cutting nozzle

14. The welding machine, which is used to convert AC welding supply to DC welding supply is

  1. Motor generator set
  2. Engine generator set
  3. Rectifier set
  4. Welding transformer

15. The correct flame for preheating before cutting is

  1. oxidizing flame
  2. neutral flame
  3. carburising flame
  4. slightly carburizing flame

16. Neutral flame in gas welding contains

  1. oxygen & Actylene in equal proportion
  2. More oxygen than Acetylene
  3. less oxygen than Acetylene
  4. None of the above

17. In DC welding heat distribution is possible between electrode and the base metal due to the change of polarity. The distribution of heat is

  1. Psitive 2/3 and negative 1 /3
  2. Positive 1 /3 and negative 2/3
  3. Positive 3/4 and negative 1/4
  4. Positive 1/4 and negative 3/4

18. The correct colours for oxygen and acetylene hoses are:

  1. Red for oxygen and blue for acetylene
  2. Black for oxygen and red for acetylene
  3. Black for oxygen and maroon for acetylene
  4. Red for oxygen and maroon for acetylene

19. Which one of the following is the type of transformer used in arc welding?

  1. Step down
  2. Step up
  3. One-to-one
  4. Capable of increasing supply voltage

20. Cast iron contains two elements, which make it difficult to cut it by gas cutting. What are these elements?

  1. Sulphur and phosphorous
  2. Silicon and graphite
  3. Graphite and phosphorous
  4. Silicon and sulphur
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